Blue Mound is a village in Macon County, Illinois, United States. The population was 1,129 at the 2000 census, and 1,017 at a 2009 estimate. It is included in the Decatur, Illinois Metropolitan Statistical Area.Blue Mound is located at 39°41′59″N 89°7′19″W / 39.69972°N 89.12194°W / 39.69972; -89.12194.According to the 2010 census, Blue Mound has a total area of 0.59 square miles, all land.One and a half miles north west of the village is located a glacial kame, a cone-shaped gravel hill rising 80 feet above the surrounding farm land. Surrounded by the Griswold Conservation Area, park and camping place, the mound is estimated to date from about 130,000 years ago in geologic time from melting of glacier ice. It is one of a group of glacial mounds in the Blue Mound area.As of the census of 2000, there were 1,129 people, 459 households, and 329 families residing in the village. The population density was 1,898.9 people per square mile.